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Difference between the mechanisms of propylene production from methanol and ethanol over ZSM-5 catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
40071 45843 2013 6 PDF Available
Title
Difference between the mechanisms of propylene production from methanol and ethanol over ZSM-5 catalysts
Abstract

•The mechanism of methanol conversion over ZSM-5 depended on the Si/Al2 ratio.•At a high Si/Al2 ratio, propylene was produced from methanol via dimethyl ether.•At a low Si/Al2 ratio, dimethyl ether was dehydrated into ethylene.•Propylene was directly produced from ethanol via ethylene.•Ethylene was transformed to a carbene (CH2) as a transient intermediate.

We investigated the difference between the mechanisms of methanol conversion and ethanol conversion to propylene over ZSM-5 catalysts. The mechanism of methanol conversion depended on the Si/Al2 ratio, whereas the mechanism of ethanol conversion did not. We believe that at a high Si/Al2 ratio, propylene was produced from methanol via dimethyl ether by means of the hydrocarbon pool mechanism. In contrast, at a low Si/Al2 ratio, dimethyl ether was dehydrated to ethylene, which was then directly converted to propylene. In the case of ethanol conversion, propylene was produced from ethylene, which was formed by intramolecular dehydration. We propose that ethylene was transformed to a carbene species, which was a transient intermediate for direct production of propylene.

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Keywords
Propylene; Ethanol; Methanol; ZSM-5; Mechanistic difference
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Difference between the mechanisms of propylene production from methanol and ethanol over ZSM-5 catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 467, 2 October 2013, Pages 380–385
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us